优化

app/src/main/java/io/legado/app/model/localBook/TextFile.kt

@@ -51,10 +51,12 @@ class TextFile(private val book: Book) {
         } else {
             book.tocUrl.toPattern(Pattern.MULTILINE)
         }
-        return analyze(rulePattern)
+        return rulePattern?.let {
+            analyze(rulePattern)
+        } ?: analyze()
     }
 
-    private fun analyze(pattern: Pattern?): ArrayList<BookChapter> {
+    private fun analyze(pattern: Pattern): ArrayList<BookChapter> {
         val toc = arrayListOf<BookChapter>()
         LocalBook.getBookInputStream(book).use { bis ->
             var blockContent: String
@@ -76,8 +78,6 @@ class TextFile(private val book: Book) {
                     .also { length = it } > 0
             ) {
                 blockPos++
-                //如果存在Chapter
-                if (pattern != null) {
                 var end = bufferStart + length
                 for (i in bufferStart + length - 1 downTo 0) {
                     if (buffer[i] == blank) {
@@ -105,7 +105,9 @@ class TextFile(private val book: Book) {
                         bis.close()
                         //移除不匹配的规则
                         tocRules.removeFirstOrNull()
-                            return analyze(tocRules.firstOrNull()?.rule?.toPattern(Pattern.MULTILINE))
+                        return tocRules.firstOrNull()?.let {
+                            analyze(it.rule.toPattern(Pattern.MULTILINE))
+                        } ?: analyze()
                     }
                     //如果 seekPos == 0 && nextChapterPos != 0 表示当前block处前面有一段内容
                     //第一种情况一定是序章 第二种情况是上一个章节的内容
@@ -162,10 +164,63 @@ class TextFile(private val book: Book) {
                     bis.close()
                     //移除不匹配的规则
                     tocRules.remove(tocRules.removeFirstOrNull())
-                        return analyze(tocRules.firstOrNull()?.rule?.toPattern(Pattern.MULTILINE))
+                    return tocRules.firstOrNull()?.let {
+                        analyze(it.rule.toPattern(Pattern.MULTILINE))
+                    } ?: analyze()
                 }
-                } else { //进行本地虚拟分章
+
+                //block的偏移点
+                curOffset += length.toLong()
+
+                //设置上一章的结尾
+                val lastChapter = toc.last()
+                lastChapter.end = curOffset
+
+                //当添加的block太多的时候，执行GC
+                if (blockPos % 15 == 0) {
+                    System.gc()
+                    System.runFinalization()
+                }
+            }
+        }
+        for (i in toc.indices) {
+            val bean = toc[i]
+            bean.index = i
+            bean.bookUrl = book.bookUrl
+            bean.url = (MD5Utils.md5Encode16(book.originName + i + bean.title))
+        }
+        book.latestChapterTitle = toc.last().title
+        book.totalChapterNum = toc.size
+
+        System.gc()
+        System.runFinalization()
+        book.tocUrl = pattern.pattern()
+        book.save()
+        return toc
+    }
+
+    private fun analyze(): ArrayList<BookChapter> {
+        val toc = arrayListOf<BookChapter>()
+        LocalBook.getBookInputStream(book).use { bis ->
+            //加载章节
+            var curOffset: Long = 0
+            //block的个数
+            var blockPos = 0
+            //读取的长度
+            var length: Int
+            val buffer = ByteArray(bufferSize)
+            var bufferStart = 3
+            bis.read(buffer, 0, 3)
+            if (Utf8BomUtils.hasBom(buffer)) {
                 bufferStart = 0
+                curOffset = 3
+            }
+            //获取文件中的数据到buffer，直到没有数据为止
+            while (bis.read(buffer, bufferStart, bufferSize - bufferStart)
+                    .also { length = it } > 0
+            ) {
+                bufferStart = 0
+                blockPos++
                 //章节在buffer的偏移量
                 var chapterOffset = 0
                 //当前剩余可分配的长度
@@ -202,17 +257,10 @@ class TextFile(private val book: Book) {
                         strLength = 0
                     }
                 }
-                }
 
                 //block的偏移点
                 curOffset += length.toLong()
 
-                if (pattern != null) {
-                    //设置上一章的结尾
-                    val lastChapter = toc.last()
-                    lastChapter.end = curOffset
-                }
-
                 //当添加的block太多的时候，执行GC
                 if (blockPos % 15 == 0) {
                     System.gc()
@@ -231,7 +279,7 @@ class TextFile(private val book: Book) {
 
         System.gc()
         System.runFinalization()
-        book.tocUrl = pattern?.pattern() ?: ""
+        book.tocUrl = ""
         book.save()
         return toc
     }